Rotary pump



R. J. P. E. COZETTE Jan. 3, 1928.

' ROTARY PUMP Filed May l0, 1926 2 Sheets-Sheet 1 Patented Jan. 3, 1928.

UNITED STATES PATENT OFFICE.

RENE JEAN PAUL EMILE COZET'IE, F NEUILLY-SUR-SEINE, FRANCE.

ROTARY PUMP.

Application filed May 10, 1926, Serial No. 108,145, and in France May 22, 1925.

In my prior specification, Serial No. 63,514

of 19th October 1925, now Patent 1,610,748,

' was described a device applicable to rotary pumps and compressors having blades with a rotor eccentrically placed relatively to the stator, for the purpose of removing the disadvantages occasioned by the friction of the outer edge of the blades against the inner surface of the stator. This device consists essentially in a drum (or casing) suitably 20, It is essential if such a device is to give a' perfectly efficient result for the rotor, with the blades and the drum (or casing) to turn at the same angular speed and for the relative positions of the blades and the distributfziigndcasing to be at each moment strictly de- If in fact the blades were on either side of the distribution orifices the apparatus would not work, since all the chambers would 80 communicate with each other. It is necessary therefore to establish a suitable mechanical connection between the rotor (or driving shaft) and the drum at a speed which is always equal to that of the movement of the rotor itself.

Inmy said prior specification Serial 63,514

a means has been suggested for producing such a connection by means of a gear system.

In another of my prior specifications Serial 4 No. 75,089 of 12th December 1925 was described another form of connection of the rotor with the rotary pump, the driving of the drum being obtained by means of a series of circular apertures placed in the form of a crown upon a plate secured to the casing and co-operating with an equal number of rollers provided upon a plate'secured tothe shaft of the rotor.

The present invention relates to a particularly simple and efficient device for obtaining the connection in question, between the rotor (or driving shaft) and the drum, in-

terposed'between the blades and the stator.

According to the invention the driving of the drum is obtained by means of a pin and slot' device, the pin and slider turning with Figure 1 is a cross section taken along the lineI-I in Figure 2.

Flgure 2 is a longitudinal section taken along the line II-II in Figure 1.

Figure 3, finally, is a cross section taken along the line IIIIII in Figure 2, the section showing the driving device.

As it will be seen in Figure 1, and in conformity to the arrangement previously proposed by the applicant, the rotor 1 of the rotary machine under consideration is enclosed in a cylindrical drum 2 mounted upon the ball bearing 3, 3; the blades 4 are guided 1n the known manner, in diametral grooves formed in the rotor.

In order that the device will give the result it is sought to obtain it is essential for the rotor and the casing 2 to turn at the same angular speed; it is, in fact. when this condition is fulfilled that the objectionable.

effects due to friction are completely obviated.

In the present invention, the connection between the rotor 1 and the casing 2 is obtained by means of the set of slidewavs shown in Figures 2 and 3. Upon one of the ends of the driving shaft 6 carrying the rotor 1 is keyed a sleeve 7 formed upon the rectangular driving member or slider 8 which is adaptedto move in a slideway 9.

The latter. in its turn. is movable in a uadrangular aperture a. b, c. d, formed in t e corresponding end 10 of the drum or casing 2.

It is obvious that if the driving shaft 6 .(and consequently the rotor) is made to turn, this shaft Wlll carry along in its movement through the medium of the sleeve 7. the rectangular member 8 and the latter transmits the movement of rotation, at the same speed, to the end 10 of the drum 2, this drive being rendered possible in spite of the eccentric mounting of the rotor relatively to the stator on account of the double-slideway arrangement which enables the slider 8 to move within its slideway in one direction lot and the slideway toomove, in the direction at rightdangles to this, within the aperture a Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is A pump comprising a rotor having a cylindrical casing and a drum eccentrically mounted to revolve within said casing having a shaft projecting through the end of said casing, reciprocating blades extending through slots in said drum and bearing against said casing, and means to rotate said drum and easing at the same angular speed comprising a cross head rotatably carried by said shaft, a guide rotatable with said casing having a rectilinear guiding edge, and a guide freely floating between said cross head and casing guide havin a portion cooperating with the uiding ing guide, and gui ed rectilinearly thereby, and itself having a rectilinear guiding edge perpendicular to the guiding edge of said casin guide by means of which said cross head is rectilinearly guided.

In testimony whereof I have signed my name to this specification.

RENE JEAN PAUL EMILE cozmrs.

edge of said ms 

